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I've made a bunch of these for buddies using a similar jig. I can't say they're perfect as anything made by hand requiring precision can be difficult, but so far they do work great. I do end up with one every now and then that just doesn't work well. Noticeably poorer performance. I just chalk it up to misalignment or poor soldering. However, for the cost I just junk them. I really would like to see more refinement of this type of antenna, if possible as they do work fantastic and are so cheap to produce.

Next Generation Pagoda

I tried placing 5.8g microstrip patches in the same hexagon arrangement within the Array Analyzer App and here's how the 3d pattern looks like:

It has such a wide beam for 16db (in my app). In the original specs, the stated gain (by Maarten Baert) is 14db.
Still, the 14db iRC Spironet big patch (a quadruple array) does not have a beam this wide.

Old vs New Showdown

I found it interesting that this Spiral Antenna RHCP design was invented in 1956! It has an ultra wide band, 3ghz to 6.5ghz. Hence we can use it for FPV (3.3/ 5.8 FPV), 5.2ghz WiFi and 5G telco network(3.4ghz). The actual PCB version of the spiral is manufactured in 2019 and I picked up one for under 11usd on AliExpress. Then I put this 1956’s RHCP design up against the 2017’s Pagoda design in a realworld FPV flighthttp://www.youtube.com/watch?v=ha4WJ5x2K3A

5.1db pagoda omni

Behold the world’s first Double-pagoda antenna with a gain of 5.1db. VAS 5.8ghz skyhammer has 5.25db of gain. Matter of fact is any double omni can max out to 5.4db of gain by increasing the separation distance between the 2 omnis. However, I prefer to have a balance of good horizontal coverage and adequate vertical coverage. 5.1db gives a radiation pattern that looks more like a flattened burger than a thick pizza.